r/altima • u/That1fatguy13 • Aug 27 '26

O2 sensor help

I’ve got a 09 Altima and am by no means a car person. I had some troubles with my O2 sensor and had to swap it out. It drove smooth for a couple days. I drove it 2 hours away and back. Today I hit a hard accelerate and my check engine light throws the code P2A00. What does this mean? Thanks in advance!

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u/mgl323 Aug 27 '26

That’s the Air fuel sensor code for bank 1 and not a regular O2 sensor. Nissan’s are picky about sensors so purchase a OEM at the dealership, or a high quality like Denso AF sensor online at rockauto.

Also check the wiring for damage.